A circle with three red tangents. The tangency points are marked red. Prove that the yellow triangle is isosceles.
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A circle with three red tangents. The tangency points are marked red. Prove that the yellow triangle is isosceles.
A regular hexagon and a square share a vertex. What’s green : red?
Two squares share a vertex. Four other vertices are connected as shown. Prove that the red points are collinear.